pe·ti·tion·er
noun/pəˈtɪʃənə(r)/
/pəˈtɪʃənər/
- a person who organizes or signs a petition
请愿者 - (law) a person who asks a court to take a particular course of action
诉愿人；上诉人 - (formal) a person who makes a formal request to somebody in authority
恳求者；请求者